 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
 
int g_val = 0;
 
int main()
{
    pid_t id = fork();
    if(id < 0)
    {
        perror("fork");
        return 0;
    }
    else if(id == 0)
    {
	    //child
        printf("child[%d]: %d : %p\n", getpid(), g_val, &g_val);
    }
    else
    { 
	    //parent
        printf("parent[%d]: %d : %p\n", getpid(), g_val, &g_val);
    }
    sleep(1);
    return 0;
}
